Q: Is 163 an irrational number

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Yes.

The sum of a rational and irrational number must be an irrational number.

No, 3.56 is not an irrational number. 3.56 is rational.

rational * irrational = irrational.

-Pi is irrational, because it does not terminate or repeat. Whenever you multiply an irrational number by a rational number (-1), the result is an irrational number.

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No because it then becomes an irrational number

The square roots of 163 are irrational.

Yes.

The square root of 163 is - approximately - 12.7671453348037 As this is a number which cannot be expressed as a fraction it is called an irrational number.

6.52 is a rational number because it can be expressed as a fraction in the form of 163/25 whereas irrational numbers can't be expressed as fractions.

An irrational number.

No. The sum of an irrational number and any other [real] number is irrational.

The sum of a rational and irrational number must be an irrational number.

No, 3.56 is not an irrational number. 3.56 is rational.

rational * irrational = irrational.

-Pi is irrational, because it does not terminate or repeat. Whenever you multiply an irrational number by a rational number (-1), the result is an irrational number.

A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.